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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        const p1 = new Promise((resolve, reject) => {
            try {
                console.log('请求a数据');
                throw new Error('warning')
                setTimeout(() => {
                    resolve('abcdefg')
                }, 2000)
            } catch (e) {
                reject(e.message)
            }
        })

        const p2 = p1.then(value => {
            console.log('成功', value);
            const re = new Promise((resolve, reject) => {
                console.log('请求b数据');
                try {
                    throw new Error('warning111')
                    setTimeout(() => {
                        console.log('p2里面的定时器');
                        resolve('bbbb')
                    }, 2000)
                } catch (e) {
                    reject(e.message)
                }
            })
            
            return re
        }, reason => {
            console.log();
        })
        console.log('p2', p2);
    </script>
</body>

</html>